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| author |   Alexey Dobriyan <adobriyan@gmail.com> | 2018-04-10 16:32:20 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-11 10:28:34 -0700 |
| commit | 4f1134370a29a5f2d0f4b4be4c5e2fddd38f0f9d (patch) | |
| tree | 0fcae1f568cf1c2870f615e214f3e92a77afcd30 /tools/testing/selftests/proc/proc-uptime-002.c | |
| parent | proc: selftests: shotgun testing of read/readdir/readlink/write (diff) | |
| download | linux-dev-4f1134370a29a5f2d0f4b4be4c5e2fddd38f0f9d.tar.xz linux-dev-4f1134370a29a5f2d0f4b4be4c5e2fddd38f0f9d.zip | |
proc: use slower rb_first()
In a typical for /proc "open+read+close" usecase, dentry is looked up
successfully on open only to be killed in dput() on close. In fact
dentries which aren't /proc/*/... and /proc/sys/* were almost NEVER
CACHED. Simple printk in proc_lookup_de() shows that.
Now that ->delete hook intelligently picks which dentries should live in
dcache and which should not, rbtree caching is not necessary as dcache
does it job, at last!
As a side effect, struct proc_dir_entry shrinks by one pointer which can
go into inline name.
Link: http://lkml.kernel.org/r/20180314231032.GA15854@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/testing/selftests/proc/proc-uptime-002.c')
0 files changed, 0 insertions, 0 deletions